Significant plot points . . . in a nutshell.
The main character is a man named Tom Smith. His occupation is "horse whisperer." The story takes place between the years 1929-1940.
Smith is hired by Charles Howard. Howard is a rich guy who wants to get into horse racing. Smith leaves on a horse finding trip to the East Coast, and comes across an over-raced horse named Seabiscuit. For some reason, Smith thinks he can be a winner of a horse.
Next step is to find a jockey. That jockey's name is Red Pollard.
Next step, train horse and jockey. End result: Seabiscuit is really fast.
Next step: find race. Take horse and jockey to Pimlico to participate in a match race against the current triple-crown winner, War Admiral. Result = Seabiscuit wins. The race was described by writers as "one of the greatest match races ever run in the ancient history of the turf."